Malicious PDF — malware analysis report

Static analysis result for SHA-256 88f5a5aef11833f3…

MALICIOUS

PDF

71.4 KB Created: 2021-09-07 23:21:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8632058347968e99b07c069751bd7f8d SHA-1: 672d791495e53fa0f4e95dc77d271414f3314df3 SHA-256: 88f5a5aef11833f37bd022cb0bf4367b7e7eeb2e56fb5ad74272b912c9b90018
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of multiple external URIs and a link farm structure indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://classicalgardenornaments.com/uplds/file/41991613832.pdf In PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/9b1d80ba57f4917b7b1cf65e381f3601/totuvu.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/36474238575.pdfIn PDF document text
    • http://romovi.net/sgi_userfiles/userfiles/files/xojikozujazelodiko.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/jumozexefu.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/c05c959a2947a53e15c8bd673a58f40c/sorumaso.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/43807086077.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/25096756972.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/22137399659.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ad95952b3d8---38285248746.pdfIn PDF document text
    • http://www.retorika-zidar.si/ckfinder/ckeditor_uploaded_files/files/niferesi.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160990faa1f373---vomipesiwizomasulupoz.pdfIn PDF document text
    • http://quadocdao.vn/uploads/files/lonok.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/54618840069.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/jatolemonekuxokozo.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/pifobikaresalipokonar.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c32e84caa---dikifudulewosatoze.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///88885165729.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/luwupilikobebokumero.pdfIn PDF document text
    • http://zoop-tech.com/ckfinder/userfiles/files/zubapuxepifaxozewef.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/7ebf07d3408ca13551cdc67f7c5329b2/radopaluvopebopodiz.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/33968185063.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=style+manual+templatePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF6 16196 bytes
SHA-256: fadcb0cf8d488d6bb75f1845552f9af346eec785f66088708a5f5961fd105db8
font_02_sfnt_off0000f965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF965 10224 bytes
SHA-256: 701f008201e1a392e6be53e955883c7e120895b349f806b57d239ae7522116f0

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